The queen comes back to protect the king.
21. e5g4  21... f6e4  22. g4e3 [%c_arrow e3f5;keyPressed;none;from;e3;opacity;0.8;to;f5;persistent;false] Good maneuvering from both sides. The knight can go to f5 now, trying to create threats around the black king. 22... a3b4 Maybe it was better to go with the queen to f8 straight away. 23. e3f5 